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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>四川省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>長(zhǎng)沙史賽克L10冷光源更換燈泡,L10</p><p><span>***更新：</span>2021-01-12 05:10:58</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="fqhzm8x" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">成都鐳伙科技有限公司</a></p><p><span>聯(lián)系人：</span>邱鋒</p><p><span>郵箱: </span>cdleihuokeji@163.com</p><p><span>電話: </span>13982269628</p><p><span>傳真: </span>028_</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>028-8444323</p><p><span>地址: </span>新都區(qū)踏水路創(chuàng)想大廈2單元2606</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="pog7bgi" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="gfxu3ld" class="box"><p><p> 連載26)雙激式變壓器開(kāi)關(guān)電源part1(連載27)雙激式變壓器開(kāi)關(guān)電源part2(連載28)整流輸出推挽式變壓器開(kāi)關(guān)電源(連載29)推挽式變壓器開(kāi)關(guān)電源儲(chǔ)能濾波電感、電容參數(shù)的計(jì)算(連載30)推挽式變壓器開(kāi)關(guān)電源儲(chǔ)能濾波電容參數(shù)的計(jì)算(連載31)推挽式開(kāi)關(guān)電源變壓器參數(shù)的計(jì)算(連載32)推挽式開(kāi)關(guān)電源的優(yōu)缺點(diǎn)(連載33)半橋式變壓器開(kāi)關(guān)電源(連載34)交流輸出半橋式變壓器開(kāi)關(guān)電源part1(連載35)交流輸出半橋式變壓器開(kāi)關(guān)電源part2(連載36)交流輸出單電容半橋式變壓器開(kāi)關(guān)電源part1(連載37)交流輸出單電容半橋式變壓器開(kāi)關(guān)電源part2(連載38)單電容半橋式變壓器開(kāi)關(guān)電源輸出電壓(連載39)整流輸出半橋式變壓器開(kāi)關(guān)電源(連載40)半橋式開(kāi)關(guān)電源儲(chǔ)能濾波電感，長(zhǎng)沙史賽克L10冷光源更換燈泡、電容參數(shù)的計(jì)算(連載41)半橋式開(kāi)關(guān)電源變壓器參數(shù)的計(jì)算(連載42)半橋式變壓器開(kāi)關(guān)電源的優(yōu)缺點(diǎn)(連載43)全橋式變壓器開(kāi)關(guān)電源(連載44)整流輸出全橋式變壓器開(kāi)關(guān)電源(連載45)全橋式開(kāi)關(guān)電源變壓器參數(shù)的計(jì)算(連載46)全橋式變壓器開(kāi)關(guān)電源的優(yōu)缺點(diǎn)(連載47)開(kāi)關(guān)電源主要器件之開(kāi)關(guān)電源變壓器(連載48)開(kāi)關(guān)變壓器的工作原理(連載49)脈沖序列對(duì)單激式開(kāi)關(guān)電源變壓器鐵芯的磁化part1(連載50)脈沖序列對(duì)單激式開(kāi)關(guān)電源變壓器鐵芯的磁化part2。其次是醫(yī)療設(shè)備的有些廠商，長(zhǎng)沙史賽克L10冷光源更換燈泡，長(zhǎng)沙史賽克L10冷光源更換燈泡，為了獲取更多的商業(yè)利潤(rùn)，想方設(shè)法、變換竅門(mén)。長(zhǎng)沙史賽克L10冷光源更換燈泡</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長(zhǎng)沙史賽克L10冷光源更換燈泡,L10" src="https://tyunfile.71360.com/UploadFile/leihuo/637397544554157120/3771438.png"></div><p> 引言對(duì)于高壓的靜電的消除關(guān)于零線是不是大地線的說(shuō)明：1．結(jié)構(gòu)的區(qū)別：零線（N）：從變壓器中性點(diǎn)接地后引出主干線。地線（PE）：從變壓器中性點(diǎn)接地后引出主干線，根據(jù)標(biāo)準(zhǔn)，每間隔20-30米重復(fù)接地。2、原理的區(qū)別：零線（N）：主要應(yīng)用于工作回路，零線所產(chǎn)生的電壓等于線阻乘以工作回路的電流。由于長(zhǎng)距離的傳輸，零線產(chǎn)生的電壓就不可忽視，作為保護(hù)人身安全的措施就變得不可靠。地線（PE）：不用于工作回路，只作為保護(hù)線。利用大地的“0”電壓，當(dāng)設(shè)備外殼發(fā)生漏電，電流會(huì)迅速流入大地，即使發(fā)生PE線有開(kāi)路的情況，也會(huì)從附近的接地體流入大地。于地線和零線的問(wèn)題樓上有幾位講的有一些道理，但又不完全是那樣子的，接地線是系統(tǒng)保護(hù)，零線是系統(tǒng)封裝。這個(gè)問(wèn)題好從系統(tǒng)設(shè)計(jì)來(lái)講，接地線和零線都可以作為電流卸載線，它們又有所不同，接地線是系統(tǒng)對(duì)地卸載點(diǎn)，零線是系統(tǒng)內(nèi)部卸載點(diǎn)。一個(gè)系統(tǒng)中可以使用放電電阻來(lái)卸載，也可以通過(guò)接地來(lái)卸載，以三相電為例，以前國(guó)外都是三相五線制，即三相火線、一根零線、一根地線；國(guó)內(nèi)都是三相四線制，即三相火線、一根地線（現(xiàn)在也改為三相五線制），在企業(yè)變電站也是將變壓器的次級(jí)零線接地。長(zhǎng)沙史賽克L10冷光源更換燈泡醫(yī)工隊(duì)伍的現(xiàn)狀很難保證在短時(shí)間內(nèi)，準(zhǔn)確地判斷設(shè)備故障，進(jìn)而高效解決問(wèn)題。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長(zhǎng)沙史賽克L10冷光源更換燈泡,L10" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397544557558229/8947445.png"></div><p> 當(dāng)?shù)刃У亩鄶?shù)載流子MOSFET關(guān)斷時(shí)，在IGBT少數(shù)載流子BJT中仍存在存儲(chǔ)時(shí)間延遲td(off)I。不過(guò)，降低Eoff驅(qū)動(dòng)阻抗將會(huì)減少米勒電容(Millercapacitance)CRES和關(guān)斷VCE的dv/dt造成的電流注到柵極驅(qū)動(dòng)回路中的風(fēng)險(xiǎn)，避免使器件重新偏置為傳導(dǎo)狀態(tài)，從而導(dǎo)致多個(gè)產(chǎn)生Eoff的開(kāi)關(guān)動(dòng)作。ZVS和ZCS拓?fù)湓诮档蚆OSFET和IGBT的關(guān)斷損耗方面很有優(yōu)勢(shì)。不過(guò)ZVS的工作優(yōu)點(diǎn)在IGBT中沒(méi)有那么大，因?yàn)楫?dāng)集電極電壓上升到允許多余存儲(chǔ)電荷進(jìn)行耗散的電勢(shì)值時(shí)，會(huì)引發(fā)拖尾沖擊電流Eoff。ZCS拓?fù)淇梢蕴嵘蟮腎GBTEoff性能。正確的柵極驅(qū)動(dòng)順序可使IGBT柵極信號(hào)在第二個(gè)集電極電流過(guò)零點(diǎn)以前不被清理，從而明顯降低IGBTZCSEoff。MOSFET的Eoff能耗是其米勒電容Crss、柵極驅(qū)動(dòng)速度、柵極驅(qū)動(dòng)關(guān)斷源阻抗及源極功率電路路徑中寄生電感的函數(shù)。該電路寄生電感Lx(如圖8所示)產(chǎn)生一個(gè)電勢(shì)，通過(guò)限制電流速度下降而增加關(guān)斷損耗。在關(guān)斷時(shí)，電流下降速度di/dt由Lx和VGS(th)決定。如果Lx=5nH，VGS(th)=4V，則大電流下降速度為VGS（th）/Lx=800A/μs?？偨Y(jié)：在選用功率開(kāi)關(guān)器件時(shí)，并沒(méi)有萬(wàn)全的解決方案，電路拓?fù)?、工作頻率、環(huán)境溫度和物理尺寸，所有這些約束都會(huì)在做出佳選擇時(shí)起著作用。</p><p> 由于邊緣處受強(qiáng)磁場(chǎng)的吸引，顯示高的電流密度，這種電流密度在端部的重新分布增加了導(dǎo)體的交流電阻，其結(jié)果比一維分析的要大很多。通過(guò)優(yōu)化銅帶邊緣的場(chǎng)分布，可以減小邊緣處的磁場(chǎng)垂直分量，這樣可以改善銅帶導(dǎo)體電流密度的分布，減小繞組高頻損耗。具體方法是在銅帶邊緣處使用高磁導(dǎo)率磁芯，減小磁路磁阻，這樣就會(huì)降低了銅帶端部的磁場(chǎng)，減小了端部的電流分布，繞組損耗將會(huì)降低，但是需要特殊的磁芯工藝。4.繞組渦流損耗對(duì)于高頻變壓器，因?yàn)榇嬖谠吅透边吚@組，所以可以通過(guò)繞組交錯(cuò)布置的方式小繞組的漏感和渦流損耗。在繞組交錯(cuò)布置時(shí)，因?yàn)樵?、副邊繞組的磁勢(shì)是相反的，此會(huì)存在一個(gè)去磁效應(yīng)，磁芯窗口中的磁勢(shì)會(huì)有一定的減小，漏磁場(chǎng)和高頻時(shí)漏磁場(chǎng)成的導(dǎo)體渦流損耗也會(huì)比較小。對(duì)于高頻電感而言，它只有一個(gè)繞組，磁路中的氣隙磁勢(shì)和繞組的磁勢(shì)平衡，在窗口中沒(méi)有其它繞組的磁勢(shì)可以和電感繞組的磁勢(shì)相平衡產(chǎn)生去磁效應(yīng)，因此電感磁芯窗口中的磁勢(shì)較大，磁場(chǎng)較強(qiáng)。通過(guò)分析可以發(fā)現(xiàn)，電感中的磁通主要分為以下幾個(gè)部分:①主磁路磁通。這部分磁通是流通在電感磁芯中的磁通，它不會(huì)在磁芯窗口中出現(xiàn)，因此它不會(huì)切割導(dǎo)體，也不會(huì)產(chǎn)生導(dǎo)體損耗。②氣隙邊緣磁通。如不及時(shí)做好清潔工作極易造成軌跡球失靈故障，嚴(yán)重的會(huì)發(fā)生電源供電單元部分故障。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長(zhǎng)沙史賽克L10冷光源更換燈泡,L10" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397544554157120/3771438.png"></div><p> 即：開(kāi)關(guān)變壓器次級(jí)線圈輸出電壓與初級(jí)線圈輸入電壓之比，n也可以看成是開(kāi)關(guān)變壓器次級(jí)線圈N2繞組與初級(jí)線圈N1繞組的匝數(shù)比，即：n=N2/N1。由此可知，在控制開(kāi)關(guān)K1接通期間，半橋式變壓器開(kāi)關(guān)電源變壓器次級(jí)輸出的正激電壓幅值只與輸入電壓和變壓器的次/初級(jí)變壓比有關(guān)系。同理我們也可以求得，當(dāng)控制開(kāi)關(guān)K2接通時(shí)，開(kāi)關(guān)變壓器N2線圈繞組輸出的正激電壓幅值(Up-)為：(Up-)=－e2=－ne1=－nUi/2K2接通期間(1-159)上式中的負(fù)號(hào)表示e2的符號(hào)與(1-158)中的符號(hào)相反，(Up-)表示與(Up)的極性相反，因?yàn)閁ab=－Uba。這里還需指出，(1-158)式和(1-159)式列出的計(jì)算結(jié)果，并沒(méi)有考慮控制開(kāi)關(guān)K1或K2關(guān)斷瞬間，勵(lì)磁電流存儲(chǔ)的能量產(chǎn)生反電動(dòng)勢(shì)的影響。當(dāng)控制開(kāi)關(guān)K1或K2關(guān)斷瞬間，流過(guò)開(kāi)關(guān)變壓器初級(jí)線圈的勵(lì)磁電流由最大值突然下降為零，使開(kāi)關(guān)變壓器鐵心中的磁通量也要跟著產(chǎn)生變化；即：開(kāi)關(guān)變壓器的初、次級(jí)線圈中都會(huì)產(chǎn)生感應(yīng)電動(dòng)勢(shì)，這種感應(yīng)電動(dòng)勢(shì)是勵(lì)磁電流存儲(chǔ)于關(guān)變壓器鐵心中的磁能量產(chǎn)生的；這種感應(yīng)電動(dòng)勢(shì)對(duì)于變壓器次級(jí)線圈電壓輸出繞組來(lái)說(shuō)，屬于反激式輸出。即：半橋式變壓器開(kāi)關(guān)電源同時(shí)存在正、反激電壓輸出。從而判斷整個(gè)電路有無(wú)故障的方法。長(zhǎng)沙史賽克L10冷光源更換燈泡</p><p style="text-indent:25px">醫(yī)院每年要支出大量的醫(yī)療設(shè)備維修費(fèi)用，而且一不小心，就會(huì)支付出大量的冤枉錢(qián)。長(zhǎng)沙史賽克L10冷光源更換燈泡</p><p> 半橋式變壓器開(kāi)關(guān)電源大的優(yōu)點(diǎn)是，對(duì)兩個(gè)開(kāi)關(guān)器件的耐壓要求比推挽式變壓器開(kāi)關(guān)電源對(duì)兩個(gè)開(kāi)關(guān)器件的耐壓要求可以降低一半。因?yàn)?，半橋式變壓器開(kāi)關(guān)電源兩個(gè)開(kāi)關(guān)器件的工作電壓只有輸入電源Ui的一半，其高耐壓等于工作電壓與反電動(dòng)勢(shì)之和，大約是電源電壓的兩倍，這個(gè)結(jié)果正好是推挽式變壓器開(kāi)關(guān)電源兩個(gè)開(kāi)關(guān)器件耐壓的一半。因此，半橋式變壓器開(kāi)關(guān)電源主要用于輸入電壓比較高的場(chǎng)合，一般電網(wǎng)電壓為交流220伏供電的大功率開(kāi)關(guān)電源大部分都是用半橋式變壓器開(kāi)關(guān)電源。半橋式開(kāi)關(guān)電源的變壓器初級(jí)線圈只需要一個(gè)繞組，這也是它的優(yōu)點(diǎn)，這對(duì)小功率開(kāi)關(guān)電源變壓器的線圈繞制多少帶來(lái)一些方便。但對(duì)于大功率開(kāi)關(guān)電源變壓器的線圈繞制沒(méi)有優(yōu)勢(shì)，因?yàn)?，大功率開(kāi)關(guān)電源變壓器的線圈需要用多股線來(lái)繞制。半橋式變壓器開(kāi)關(guān)電源的缺點(diǎn)主要是電源利用率比較低，因此，半橋式變壓器開(kāi)關(guān)電源不適宜用于工作電壓較低的場(chǎng)合。另外，半橋式變壓器開(kāi)關(guān)電源中的兩個(gè)開(kāi)關(guān)器件連接沒(méi)有公共地，與驅(qū)動(dòng)信號(hào)連接比較麻煩。半橋式開(kāi)關(guān)電源大的缺點(diǎn)是，當(dāng)兩個(gè)控制開(kāi)關(guān)K1和K2處于交替轉(zhuǎn)換工作狀態(tài)的時(shí)候，兩個(gè)開(kāi)關(guān)器件會(huì)同時(shí)出現(xiàn)一個(gè)很短時(shí)間的半導(dǎo)通區(qū)域，即兩個(gè)控制開(kāi)關(guān)同時(shí)處于接通狀態(tài)。長(zhǎng)沙史賽克L10冷光源更換燈泡</p><p style="text-indent:25px">成都鐳伙科技有限公司是一家電子技術(shù)研究開(kāi)發(fā)及轉(zhuǎn)讓、電氣設(shè)備、醫(yī)療設(shè)備維護(hù)服務(wù)、機(jī)械設(shè)備的設(shè)計(jì)、銷(xiāo)售；電器用品、醫(yī)療器械；貨物及技術(shù)進(jìn)出口。專(zhuān)業(yè)維修直管硬鏡、攝像系統(tǒng)、冷光源、氣腹機(jī)、動(dòng)力系統(tǒng)、灌注泵、動(dòng)力系統(tǒng)手柄、超聲刀手柄。軟質(zhì)器械激光焊接。的公司，是一家集研發(fā)、設(shè)計(jì)、生產(chǎn)和銷(xiāo)售為一體的專(zhuān)業(yè)化公司。成都鐳伙科技擁有一支經(jīng)驗(yàn)豐富、技術(shù)創(chuàng)新的專(zhuān)業(yè)研發(fā)團(tuán)隊(duì)，以高度的專(zhuān)注和執(zhí)著為客戶提供內(nèi)窺鏡以及維修周邊，動(dòng)力系統(tǒng)及手柄附件維修，攝像系統(tǒng)主機(jī)及攝像頭維修，手術(shù)器械類(lèi)維修。成都鐳伙科技始終以本分踏實(shí)的精神和必勝的信念，影響并帶動(dòng)團(tuán)隊(duì)取得成功。成都鐳伙科技創(chuàng)始人張成亮，始終關(guān)注客戶，創(chuàng)新科技，竭誠(chéng)為客戶提供良好的服務(wù)。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2809917.html</p></div></div></div></div></div><div id="2umrtqi" class="page-right twoColRt"><div id="7g7blho" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="g8aiace" class="recomPic likePro"><a 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